Screenshot of breakupnotifier.com, the site for a new but now disabled stalker-friendly app.

“You like someone. They’re in a relationship. Be the first to know when they’re out of it.”

That’s the tagline for Breakup Notifier[2], a new but now-disabled Facebook [3]app. Here’s how it worked when it did work: After downloading the software program, select the Facebook[4] friends you’re interested in and when that person changes their relationship status, you receive an email notification.

The app’s creator, Dan Loewenherz[5], has tried, without success, to get Facebook to unblock the program.

The New York Daily New[6]s wrote about the app on Monday, with Loewenherz claiming in the story that the free program attracted more than 100,000 users within 24 hours of launch.